Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40
The AirTAC SAIJ125X200-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 160-200 mm usable travel window, allowing you to dial back the 200 mm nominal stroke by up to 40 mm during commissioning. Delivering 6136 N of pull force at 0.5 MPa, it is built with a SUS304 stainless steel rod for corrosion resistance and uses PT tapered ports.
The rear adjuster acts purely as a mechanical stop to set the retract end position and cannot hold a load without live air pressure. For load-holding without continuous air, a SAIL pneumatic lock or BSAI clamp-lock cylinder is required. This model includes dual-side sensor grooves for CMSE reed and DMSE electronic switches, though no magnet is installed on this variant.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40 Is Used
Product Changeover Tuning
Dial in the exact retract position within the 160-200 mm window when switching packaging sizes on a line, eliminating the need for machined spacer plates.
Press Fit Calibration
Fine-tune the end-of-stroke stopping point during machine commissioning to achieve precise pressing depths without physically remounting the actuator.
Variable End-Stop Automation
Set a hard mechanical stop for a heavy-duty assembly station, using the 6136 N pull force to retract the tooling safely after each cycle.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40 the Right Cylinder?
Choose this 125 mm bore when you need higher force than an 80 mm bore (which provides 2268 N pull at 0.5 MPa) but want to avoid the bulk of a 160 mm cylinder. The adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end-stops for product changeovers, saving the effort of swapping cylinders or adding external stopper blocks.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 200 mm stroke, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). The 32 mm rod thread (M27x2) handles high side loads, but because the stroke is 200 mm, ensure an external guide is used if the load is heavy or off-center.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX200-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. It can deliver a maximum push force of 11045 N at 0.7 MPa.
The rear adjuster screw lets you shorten the effective travel from 200 mm down to 160 mm. This creates a 40 mm adjustable window for fine-tuning the end position at commissioning, but the adjuster functions only as a stop and does not lock the load without air pressure.
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